2х-4,5>6х-0,5(4х-3) 2х-4,5>6Х-2Х+1,5 2Х+2Х-6Х>1,5+4,5 -2Х>6 Х>6/-2 Х>-3
3x + 5y = 12 3x + 5y = 12 3x+5y-3x+6y=12+21 11y= 33 y= 3
x - 2y = - 7| ×(-3) -3x+6y=21 -3x+6y=21 -3x+6y=21 -3x+6y=21
y= 3 y= 3 y= 3 y= 3
-3x+6×3=21 -3x=21-18 -3x=3 x=-1
или
3x + 5y = 12 3x + 5y = 12 3(-7+2y)+5y=12 -21+6y+5y=12 11y=33
x - 2y = - 7 x = - 7+2y x = - 7+2y x = - 7+2y x = - 7+2y
y=3 y=3
x = - 7+2×3 x=-1
6x=3y+1
x=(3y+1)/6
-x+2y=5
-x=-2y+5
x=2y-5
-x+3a+b=0
-x=-3a-b
x=3a+b
6-kx+4a=5b
-kx=5b-4a-6
x=(6+4a-5b)/k